The arrangement and continuity of
common neutral conductors shall conform to the following requirements:

Cross ties of the neutral
conductor shall be made to form a continuous interconnected grid network and
there shall be not less than two or more separate and continuous metallic
return conductors from the grid network to the substation constituting the
source of supply thereto.

If two return conductors only are used, each shall
have a minimum conductivity of approximately 50 per cent of the conductivity of
the primary phase conductor of the largest overhead feeder serving the
area.(See Table No. 14 of Rule 59.3-B
for minimum sizes.)

If more than two return
conductors are used, the current-carrying capacity of the return system shall
be such that a break in any one path shall leave two or more return paths
which, combined, shall have a minimum area of approximately 50 per cent of the
area of the primary phase conductor of the largest overhead feeder serving the
area, thus providing adequate current-carrying capacity for full load
current.(see Table No. 14 of Rule
59.3-B for minimum sizes.)

Primary neutral conductors or
secondary neutral conductors, where continuous, may be used as a return loop
from a common neutral provided they are of sufficient current-carrying capacity
as specified in Rule 59.3-B and provided that they are grounded throughout in
accordance with the requirements for common neutral line conductors as
specified in Rule 59.4-B. Primary or secondary neutral line conductors so used
shall be carried in their normal primary or secondary positions respectively.

Strikeout
and Underline Version

Rule 59.3-D

59.3-D.
Neutral
ConductorsArrangement And Continuity

The arrangement and continuity of
common neutral conductors shall conform to the following requirements:

(1)
Continuity: Cross ties of the common
neutral conductor shall be made to form a continuous interconnected grid
network.and

(2)
Minimum Number of Return Paths:
there shall be not not be less than two or more separate and
continuous metallic return conductors from the grid network to the substation
constituting the source of supply thereto.

(3)
Two
Return Conductor Paths: If only two return common neutral
conductors pathsonly are used, each path shall
have a minimum conductivity of approximately 50 per cent of the conductivityampacity of not less than one-quarter (25%) that of the largest
related primary phase conductor, provided that the short time ampacity
of the common neutral conductor is maintainedof the largest overhead
feeder serving the area.(See Table No.
14 of Rule 59.3-B for minimum sizes.).

(4)
More Than Two Return Conductor Paths:
If more than two return common neutral conductors paths
are used, the current-carrying capacityampacity of the return
system shall be such that a break in any one path shall leave two or more
return common neutral paths.which,These combined paths, shall
have a minimum conductivityampacity of not less than one-quarter
(25%) thatof approximately 50 per cent of the conductivity of the largest
primary phase conductor of the largest overhead feeder serving the area,
provided that the short time ampacity of the common neutral conductor is
maintainedthus providing adequate current-carrying capacity for full
load current.(see Table No. 14 of Rule
59.3-B for minimum sizes.).

(5) Primary and Secondary Neutral
Conductors: Primary neutral conductors or secondary neutral conductors,
where continuous, may be used as a return loop from a common neutral provided they
are ofhave sufficient current-carrying capacityampacity
as specified in Rule 59.3-B and provided that they are grounded
throughout in accordance with the requirements for common neutral line
conductors as specified in Rule 59.4-B. Primary or secondary neutral line
conductors so used shall be carried in their normal primary or secondary
positions respectively.

Final Version

Rule 59.3-D

59.3-D.
Arrangement And Continuity

The arrangement and continuity of
common neutral conductors shall conform to the following requirements:

(1)
Continuity: Cross ties of the common
neutral conductor shall be made to form a continuous interconnected grid
network.

(2)
Minimum Number of Return Paths: there
shall not be less than two or more separate and continuous metallic return
conductors from the grid network to the substation constituting the source of
supply thereto.

(3)
Two
Return Conductor Paths: If only two return common neutral conductors paths
only are used, each path shall have a ampacity of not less than
one-quarter (25%) that of the largest related primary phase conductor, provided
that the short time ampacity of the common neutral conductor is maintained.

(4)
More Than Two Return Conductor Paths:
If more than two return common neutral conductors paths are used, the ampacity
of the return system shall be such that a break in any one path shall leave two
or more return common neutral paths. These combined paths, shall have a minimum
ampacity of not less than one-quarter (25%) that of the largest primary phase
conductor of the overhead feeder serving the area, provided that the short time
ampacity of the common neutral conductor is maintained.

(5) Primary and Secondary Neutral
Conductors: Primary neutral conductors or secondary neutral conductors, where
continuous, may be used as a return loop from a common neutral provided they have
sufficient ampacity as specified in Rule 59.3-B and are grounded throughout in
accordance with the requirements for common neutral conductors as specified in
Rule 59.4-B. Primary or secondary neutral line conductors so used shall be
carried in their normal primary or secondary positions respectively.